| Mechanism transition and strong temperature dependence of dislocation nucleation from grain boundaries: An accelerated molecular dynamics study | |
| Du JP; Wang YJ(王云江); Lo YC; Wan L; Ogata S; Wang, YJ (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China. | |
| Source Publication | PHYSICAL REVIEW B
 |
| 2016 | |
| Volume | 94Issue:10Pages:104110 |
| ISSN | 2469-9950 |
| Abstract | Accelerated molecular dynamics reveals a mechanism transition and strong temperature dependence of dislocation nucleation from grain boundaries (GBs) in Cu. At stress levels up to similar to 90% of the ideal dislocationnucleation stress, atomic shuffling at the E structural unit in a GB acts as a precursor to dislocation nucleation, and eventually a single dislocation is nucleated. At very high stress levels near the ideal dislocation-nucleation stress, a multiple dislocation is collectively nucleated. In these processes, the activation free energy and activation volume depend strongly on temperature. The strain-rate dependence of the critical nucleation stress is studied and the result shows that the mechanism transition from the shuffling-assisted dislocation-nucleation mechanism to the collective dislocation-nucleationmechanism occurs during the strain rate increasing from 10(-4) s(-1) to 10(10) s(-1). |
| DOI | 10.1103/PhysRevB.94.104110 |
| URL | 查看原文 |
| Indexed By | SCI ; EI |
| Language | 英语 |
| WOS ID | WOS:000383141100001 |
| WOS Research Area | Physics |
| WOS Subject | Physics, Condensed Matter |
| Funding Organization | This work was supported by Grants-in-Aid for Scientific Research in Innovative Area (Grant No. 22102003), Scientific Research (A) (Grant No. 23246025), Challenging Exploratory Research (Grant No. 25630013), and the Elements Strategy Initiative for Structural Materials (ESISM). Y.W. acknowledges financial support from the NSFC (Grants No. 11402269 and No. 11672299). |
| Department | LNM冲击动力学与新型材料力学性能 |
| Classification | 一类 |
| Ranking | False |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://dspace.imech.ac.cn/handle/311007/59733 |
| Collection | 非线性力学国家重点实验室 |
| Corresponding Author | Wang, YJ (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China. |
| Recommended Citation GB/T 7714 | Du JP,Wang YJ,Lo YC,et al. Mechanism transition and strong temperature dependence of dislocation nucleation from grain boundaries: An accelerated molecular dynamics study[J]. PHYSICAL REVIEW B,2016,94(10):104110. |
| APA | Du JP,王云江,Lo YC,Wan L,Ogata S,&Wang, YJ .(2016).Mechanism transition and strong temperature dependence of dislocation nucleation from grain boundaries: An accelerated molecular dynamics study.PHYSICAL REVIEW B,94(10),104110. |
| MLA | Du JP,et al."Mechanism transition and strong temperature dependence of dislocation nucleation from grain boundaries: An accelerated molecular dynamics study".PHYSICAL REVIEW B 94.10(2016):104110. |
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| a2016-149.pdf（1084KB） | 期刊论文 | 作者接受稿 | 开放获取 | CC BY-NC-SA | View Download | |
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